Amphastar Pharmaceuticals (AMPH) Stock Chart & Stock Price History $29.10 -0.30 (-1.00%) As of 02:35 PM Eastern This is a fair market value price provided by Polygon.io. Learn more. Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Amphastar Pharmaceuticals Stock Price Performance The Amphastar Pharmaceuticals (AMPH) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 37.96%, with a year-to-date return of -21.64%. In the past month, the stock has increased 35.96%, reflecting recent market activity. As of the latest close, Amphastar Pharmaceuticals traded at $29.39 with a market cap of $1.37 billion and volume of 566,956 shares. Five years ago, the stock traded at $19.92, representing a 46.06% increase over that period. At the time, it had a market cap of $963.01 million and a volume of 131,805 shares. Receive AMPH Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. Subscribe Now View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. Text HELP for help/customer support. Unsubscribe at any time by replying "STOP" to any text message that you receive from MarketBeat or by visiting our mailing preferences page. Read our full terms of service and privacy policy. 5 Day Performance-4.98%1 Month Performance+35.96%3 Month Performance+12.51%Year-To-Date Performance-21.64%1 Year Performance-37.96%5 Year Performance+46.06% AMPH Stock Chart for Thursday, September, 4, 2025 AMPH Chart by TradingView Amphastar Pharmaceuticals Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization09/03/2025$30.81$29.39-4.61%$31.10$29.29566,956 shs$1.37 billion09/02/2025$30.62$30.81+0.62%$31.26$30.44414,770 shs$1.43 billion09/01/2025$30.62$30.62$30.81$30.18290,925 shs$1.42 billion08/29/2025$30.26$30.62+1.19%$30.81$30.18290,925 shs$1.42 billion08/28/2025$30.49$30.26-0.75%$30.56$29.86316,391 shs$1.41 billion08/27/2025$30.34$30.49+0.49%$30.95$30.10326,043 shs$1.42 billion08/26/2025$29.83$30.34+1.71%$30.80$29.93408,345 shs$1.41 billion08/25/2025$30.50$29.83-2.20%$30.55$29.47374,382 shs$1.39 billion08/22/2025$29.66$30.50+2.83%$30.90$29.98494,895 shs$1.42 billion08/21/2025$29.62$29.66+0.14%$30.42$29.43491,388 shs$1.38 billion Get the Latest News and Ratings for AMPH and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 08/20/2025$30.33$29.62-2.34%$30.39$29.42434,164 shs$1.38 billion08/19/2025$29.76$30.33+1.92%$30.99$29.85527,802 shs$1.41 billion08/18/2025$29.83$29.76-0.23%$30.65$29.58433,135 shs$1.38 billion08/15/2025$30.21$29.83-1.26%$30.63$29.82651,991 shs$1.39 billion08/14/2025$30.48$30.21-0.89%$30.63$29.64464,374 shs$1.40 billion08/13/2025$30.35$30.48+0.43%$31.23$30.001.02 million shs$1.42 billion08/12/2025$27.36$30.35+10.93%$30.63$28.141.60 million shs$1.41 billion08/11/2025$23.81$27.36+14.91%$27.41$24.691.82 million shs$1.27 billion08/08/2025$21.62$23.81+10.13%$24.70$22.071.00 million shs$1.12 billion08/07/2025$20.82$21.62+3.84%$21.74$20.70705,090 shs$1.02 billion08/06/2025$21.44$20.82-2.89%$21.68$20.79414,579 shs$981.46 million08/05/2025$21.40$21.44+0.19%$21.57$21.18388,966 shs$1.01 billion08/04/2025$21.21$21.40+0.90%$21.43$20.88463,650 shs$1.01 billion Related Companies NUVL Stock Chart MRUS Stock Chart CRSP Stock Chart TGTX Stock Chart CYTK Stock Chart AAPG Stock Chart KRYS Stock Chart ACAD Stock Chart ADMA Stock Chart TLX Stock Chart Receive AMPH Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 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